It's a filter, it fits and it works. I just wish the secondary filter were not attached to the chemical filter pad (just carbon like most filters). I have a planted tank. Having two physical filters is useful to remove algae while supplying light/CO2 to plants but the carbon pad will remove nutrient that the plants would like. The filter a VERY difficult to wash/rinse and is easily worn out of you try and remove any algae from either side of the pad. The foam pad can just me squeezed (like a sponge) to the waste water during water changes to remove excess algae but not these darn pads. Thus I'm removing a star for a bad design issue for planted tanks. It's like to be able to clean both the sponge and pad but simply remove the carbon filter and you can not do so with the U series. If anyone knows how to remove or deactivate the charcoal side please leave a comment. After a couple of months I had to give up and replace the filthy filter that lasted trough initial cycling.
I replace both polycarbon pads in the U3 filter every 3-4 weeks. Along with weekly partial water changes, it keeps the ammonia level down in my turtles tank and the water clear.
Buy Fluval U3 Underwater Filter Poly/Carbon Now
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